Fig. 6

Comparison of the most conserved region [near the YGGY motif of helix III (Coleman 2009)] of nuclear rDNA ITS-2 secondary structure between strains of four mating systems of Volvox africanus and V. reticuliferus (Table 1). Note the modified YGGY motif (boldface). For secondary structures of ITS-2, see Nozaki et al. (2015a). Red and black open boxes indicate compensatory base changes between Homo II strains (from Thailand and USA) and those of other sexual systems